Same problem as your last question, you are importing the files in an order that does not follow the freeing key constraints. I.e. You can't create a teacher in a department if the department doesn't exist yet. You can't create a class if the teacher doesn't exist yet...
I can't explain it any clearer. Maybe someone else can.

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the explanation of the error has been given: you must
either:
* load the tables in the order so that the "parent tables" are loaded first
OR
* create the tables without the foreign keys, then load data in any order, then create the foreign keys

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